!-------------------------------------------------------------LICENSE--------------------------------------------------------------!
!                                                                                                                                  !
!The MAP code is written in Fortran language for magnetohydrodynamics (MHD) calculation with the adaptive mesh refinement (AMR)    !
!and Message Passing Interface (MPI) parallelization.                                                                              !
!                                                                                                                                  !
!Copyright (C) 2012                                                                                                                !
!Ronglin Jiang                                                                                                                     !
!rljiang@ssc.net.cn                                                                                                                !
!585 Guoshoujing Road. Pudong, Shanghai, P.R.C. 201203                                                                             !
!                                                                                                                                  !
!This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License         !
!as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.             !
!                                                                                                                                  !
!This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of    !
!MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.                        !
!                                                                                                                                  !
!You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software     !
!Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.                                                   !
!                                                                                                                                  !
!-------------------------------------------------------------LICENSE--------------------------------------------------------------!

!==================================================================================================================================|
subroutine bnd_user(ro, mx, my, mz, bx, by, bz, en, gx, gy, po,                                                                    &
                    ro0, mx0, my0, mz0, bx0, by0, bz0, en0,                                                                        &
                    x, y, nx, ny, dir, sides)
!==================================================================================================================================|
!  sides = 'l' for lower boundary
!  sides = 'h' for higher boundary
!  sides = 'b' for both
!----------------------------------------------------------------------------------------------------------------------------------|

   use parameters
   implicit none

   character(1), intent(in) ::  dir, sides
   integer(4), intent(in) :: nx, ny
   real(8), intent(in) :: x(nx), y(ny)
   real(8), dimension(nx, ny), intent(inout) :: ro, mx, my, mz, bx, by, bz, en, gx, gy, po
   real(8), dimension(nx, ny), intent(in) :: ro0, mx0, my0, mz0, bx0, by0, bz0, en0

   integer(4) :: i, j, i_s, j_s, i_e, j_e

!----------------------------------------------------------------------------------------------------------------------------------|
!  array index
!----------------------------------------------------------------------------------------------------------------------------------|
   if (dir .eq. 'x' .and. sides .eq. 'l') then
      i_s = 1
      i_e = ng
      j_s = 1
      j_e = ny
   elseif (dir .eq. 'x' .and. sides .eq. 'h') then
      i_s = nx - ng + 1
      i_e = nx
      j_s = 1
      j_e = ny
   elseif (dir .eq. 'y' .and. sides .eq. 'l') then
      i_s = 1
      i_e = nx
      j_s = 1
      j_e = ng
   elseif (dir .eq. 'y' .and. sides .eq. 'h') then
      i_s = 1
      i_e = nx
      j_s = ny - ng + 1
      j_e = ny
   endif

   do j = j_s, j_e
   do i = i_s, i_e
!      ro(i, j, k) = ro0(i, j, k)
!      mx(i, j, k) = mx0(i, j, k)
!      my(i, j, k) = my0(i, j, k)
!      mz(i, j, k) = mz0(i, j, k)
!      bx(i, j, k) = bx0(i, j, k)
!      by(i, j, k) = by0(i, j, k)
!      bz(i, j, k) = bz0(i, j, k)
!      en(i, j, k) = en0(i, j, k)
   enddo
   enddo

!----------------------------------------------------------------------------------------------------------------------------------|
   return
end subroutine bnd_user
